git.oblomov.eu Git - linux-2.6/blob - drivers/video/vesafb.c

   1 /*
   2  * framebuffer driver for VBE 2.0 compliant graphic boards
   3  *
   4  * switching to graphics mode happens at boot time (while
   5  * running in real mode, see arch/i386/boot/video.S).
   6  *
   7  * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
   8  *
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/string.h>
  15 #include <linux/mm.h>
  16 #include <linux/tty.h>
  17 #include <linux/slab.h>
  18 #include <linux/delay.h>
  19 #include <linux/fb.h>
  20 #include <linux/ioport.h>
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23
  24 #include <video/vga.h>
  25 #include <asm/io.h>
  26 #include <asm/mtrr.h>
  27
  28 #define dac_reg (0x3c8)
  29 #define dac_val (0x3c9)
  30
  31 /* --------------------------------------------------------------------- */
  32
  33 static struct fb_var_screeninfo vesafb_defined __initdata = {
  34         .activate       = FB_ACTIVATE_NOW,
  35         .height         = -1,
  36         .width          = -1,
  37         .right_margin   = 32,
  38         .upper_margin   = 16,
  39         .lower_margin   = 4,
  40         .vsync_len      = 4,
  41         .vmode          = FB_VMODE_NONINTERLACED,
  42 };
  43
  44 static struct fb_fix_screeninfo vesafb_fix __initdata = {
  45         .id     = "VESA VGA",
  46         .type   = FB_TYPE_PACKED_PIXELS,
  47         .accel  = FB_ACCEL_NONE,
  48 };
  49
  50 static int             inverse   = 0;
  51 static int             mtrr      = 0; /* disable mtrr */
  52 static int             vram_remap __initdata = 0; /* Set amount of memory to be used */
  53 static int             vram_total __initdata = 0; /* Set total amount of memory */
  54 static int             pmi_setpal = 0;  /* pmi for palette changes ??? */
  55 static int             ypan       = 0;  /* 0..nothing, 1..ypan, 2..ywrap */
  56 static unsigned short  *pmi_base  = NULL;
  57 static void            (*pmi_start)(void);
  58 static void            (*pmi_pal)(void);
  59 static int             depth;
  60
  61 /* --------------------------------------------------------------------- */
  62
  63 static int vesafb_pan_display(struct fb_var_screeninfo *var,
  64                               struct fb_info *info)
  65 {
  66 #ifdef __i386__
  67         int offset;
  68
  69         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
  70
  71         __asm__ __volatile__(
  72                 "call *(%%edi)"
  73                 : /* no return value */
  74                 : "a" (0x4f07),         /* EAX */
  75                   "b" (0),              /* EBX */
  76                   "c" (offset),         /* ECX */
  77                   "d" (offset >> 16),   /* EDX */
  78                   "D" (&pmi_start));    /* EDI */
  79 #endif
  80         return 0;
  81 }
  82
  83 static void vesa_setpalette(int regno, unsigned red, unsigned green,
  84                             unsigned blue)
  85 {
  86 #ifdef __i386__
  87         struct { u_char blue, green, red, pad; } entry;
  88         int shift = 16 - depth;
  89
  90         if (pmi_setpal) {
  91                 entry.red   = red   >> shift;
  92                 entry.green = green >> shift;
  93                 entry.blue  = blue  >> shift;
  94                 entry.pad   = 0;
  95                 __asm__ __volatile__(
  96                 "call *(%%esi)"
  97                 : /* no return value */
  98                 : "a" (0x4f09),         /* EAX */
  99                   "b" (0),              /* EBX */
 100                   "c" (1),              /* ECX */
 101                   "d" (regno),          /* EDX */
 102                   "D" (&entry),         /* EDI */
 103                   "S" (&pmi_pal));      /* ESI */
 104         } else {
 105                 /* without protected mode interface, try VGA registers... */
 106                 outb_p(regno,       dac_reg);
 107                 outb_p(red   >> shift, dac_val);
 108                 outb_p(green >> shift, dac_val);
 109                 outb_p(blue  >> shift, dac_val);
 110         }
 111 #endif
 112 }
 113
 114 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 115                             unsigned blue, unsigned transp,
 116                             struct fb_info *info)
 117 {
 118         /*
 119          *  Set a single color register. The values supplied are
 120          *  already rounded down to the hardware's capabilities
 121          *  (according to the entries in the `var' structure). Return
 122          *  != 0 for invalid regno.
 123          */
 124
 125         if (regno >= info->cmap.len)
 126                 return 1;
 127
 128         if (info->var.bits_per_pixel == 8)
 129                 vesa_setpalette(regno,red,green,blue);
 130         else if (regno < 16) {
 131                 switch (info->var.bits_per_pixel) {
 132                 case 16:
 133                         if (info->var.red.offset == 10) {
 134                                 /* 1:5:5:5 */
 135                                 ((u32*) (info->pseudo_palette))[regno] =
 136                                         ((red   & 0xf800) >>  1) |
 137                                         ((green & 0xf800) >>  6) |
 138                                         ((blue  & 0xf800) >> 11);
 139                         } else {
 140                                 /* 0:5:6:5 */
 141                                 ((u32*) (info->pseudo_palette))[regno] =
 142                                         ((red   & 0xf800)      ) |
 143                                         ((green & 0xfc00) >>  5) |
 144                                         ((blue  & 0xf800) >> 11);
 145                         }
 146                         break;
 147                 case 24:
 148                 case 32:
 149                         red   >>= 8;
 150                         green >>= 8;
 151                         blue  >>= 8;
 152                         ((u32 *)(info->pseudo_palette))[regno] =
 153                                 (red   << info->var.red.offset)   |
 154                                 (green << info->var.green.offset) |
 155                                 (blue  << info->var.blue.offset);
 156                         break;
 157                 }
 158         }
 159
 160         return 0;
 161 }
 162
 163 static struct fb_ops vesafb_ops = {
 164         .owner          = THIS_MODULE,
 165         .fb_setcolreg   = vesafb_setcolreg,
 166         .fb_pan_display = vesafb_pan_display,
 167         .fb_fillrect    = cfb_fillrect,
 168         .fb_copyarea    = cfb_copyarea,
 169         .fb_imageblit   = cfb_imageblit,
 170 };
 171
 172 static int __init vesafb_setup(char *options)
 173 {
 174         char *this_opt;
 175
 176         if (!options || !*options)
 177                 return 0;
 178
 179         while ((this_opt = strsep(&options, ",")) != NULL) {
 180                 if (!*this_opt) continue;
 181
 182                 if (! strcmp(this_opt, "inverse"))
 183                         inverse=1;
 184                 else if (! strcmp(this_opt, "redraw"))
 185                         ypan=0;
 186                 else if (! strcmp(this_opt, "ypan"))
 187                         ypan=1;
 188                 else if (! strcmp(this_opt, "ywrap"))
 189                         ypan=2;
 190                 else if (! strcmp(this_opt, "vgapal"))
 191                         pmi_setpal=0;
 192                 else if (! strcmp(this_opt, "pmipal"))
 193                         pmi_setpal=1;
 194                 else if (! strncmp(this_opt, "mtrr:", 5))
 195                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
 196                 else if (! strcmp(this_opt, "nomtrr"))
 197                         mtrr=0;
 198                 else if (! strncmp(this_opt, "vtotal:", 7))
 199                         vram_total = simple_strtoul(this_opt+7, NULL, 0);
 200                 else if (! strncmp(this_opt, "vremap:", 7))
 201                         vram_remap = simple_strtoul(this_opt+7, NULL, 0);
 202         }
 203         return 0;
 204 }
 205
 206 static int __init vesafb_probe(struct platform_device *dev)
 207 {
 208         struct fb_info *info;
 209         int i, err;
 210         unsigned int size_vmode;
 211         unsigned int size_remap;
 212         unsigned int size_total;
 213
 214         if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
 215                 return -ENODEV;
 216
 217         vesafb_fix.smem_start = screen_info.lfb_base;
 218         vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
 219         if (15 == vesafb_defined.bits_per_pixel)
 220                 vesafb_defined.bits_per_pixel = 16;
 221         vesafb_defined.xres = screen_info.lfb_width;
 222         vesafb_defined.yres = screen_info.lfb_height;
 223         vesafb_fix.line_length = screen_info.lfb_linelength;
 224         vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 225                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 226
 227         /*   size_vmode -- that is the amount of memory needed for the
 228          *                 used video mode, i.e. the minimum amount of
 229          *                 memory we need. */
 230         size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
 231
 232         /*   size_total -- all video memory we have. Used for mtrr
 233          *                 entries, ressource allocation and bounds
 234          *                 checking. */
 235         size_total = screen_info.lfb_size * 65536;
 236         if (vram_total)
 237                 size_total = vram_total * 1024 * 1024;
 238         if (size_total < size_vmode)
 239                 size_total = size_vmode;
 240
 241         /*   size_remap -- the amount of video memory we are going to
 242          *                 use for vesafb.  With modern cards it is no
 243          *                 option to simply use size_total as that
 244          *                 wastes plenty of kernel address space. */
 245         size_remap  = size_vmode * 2;
 246         if (vram_remap)
 247                 size_remap = vram_remap * 1024 * 1024;
 248         if (size_remap < size_vmode)
 249                 size_remap = size_vmode;
 250         if (size_remap > size_total)
 251                 size_remap = size_total;
 252         vesafb_fix.smem_len = size_remap;
 253
 254 #ifndef __i386__
 255         screen_info.vesapm_seg = 0;
 256 #endif
 257
 258         if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
 259                 printk(KERN_WARNING
 260                        "vesafb: cannot reserve video memory at 0x%lx\n",
 261                         vesafb_fix.smem_start);
 262                 /* We cannot make this fatal. Sometimes this comes from magic
 263                    spaces our resource handlers simply don't know about */
 264         }
 265
 266         info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
 267         if (!info) {
 268                 release_mem_region(vesafb_fix.smem_start, size_total);
 269                 return -ENOMEM;
 270         }
 271         info->pseudo_palette = info->par;
 272         info->par = NULL;
 273
 274         info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
 275         if (!info->screen_base) {
 276                 printk(KERN_ERR
 277                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
 278                         vesafb_fix.smem_len, vesafb_fix.smem_start);
 279                 err = -EIO;
 280                 goto err;
 281         }
 282
 283         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
 284                "using %dk, total %dk\n",
 285                vesafb_fix.smem_start, info->screen_base,
 286                size_remap/1024, size_total/1024);
 287         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
 288                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
 289
 290         if (screen_info.vesapm_seg) {
 291                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
 292                        screen_info.vesapm_seg,screen_info.vesapm_off);
 293         }
 294
 295         if (screen_info.vesapm_seg < 0xc000)
 296                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 297
 298         if (ypan || pmi_setpal) {
 299                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
 300                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 301                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 302                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
 303                 if (pmi_base[3]) {
 304                         printk(KERN_INFO "vesafb: pmi: ports = ");
 305                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
 306                                         printk("%x ",pmi_base[i]);
 307                         printk("\n");
 308                         if (pmi_base[i] != 0xffff) {
 309                                 /*
 310                                  * memory areas not supported (yet?)
 311                                  *
 312                                  * Rules are: we have to set up a descriptor for the requested
 313                                  * memory area and pass it in the ES register to the BIOS function.
 314                                  */
 315                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
 316                                 ypan = pmi_setpal = 0;
 317                         }
 318                 }
 319         }
 320
 321         vesafb_defined.xres_virtual = vesafb_defined.xres;
 322         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
 323         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
 324                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
 325                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
 326         } else {
 327                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
 328                 vesafb_defined.yres_virtual = vesafb_defined.yres;
 329                 ypan = 0;
 330         }
 331
 332         /* some dummy values for timing to make fbset happy */
 333         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
 334         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 335         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 336
 337         vesafb_defined.red.offset    = screen_info.red_pos;
 338         vesafb_defined.red.length    = screen_info.red_size;
 339         vesafb_defined.green.offset  = screen_info.green_pos;
 340         vesafb_defined.green.length  = screen_info.green_size;
 341         vesafb_defined.blue.offset   = screen_info.blue_pos;
 342         vesafb_defined.blue.length   = screen_info.blue_size;
 343         vesafb_defined.transp.offset = screen_info.rsvd_pos;
 344         vesafb_defined.transp.length = screen_info.rsvd_size;
 345
 346         if (vesafb_defined.bits_per_pixel <= 8) {
 347                 depth = vesafb_defined.green.length;
 348                 vesafb_defined.red.length =
 349                 vesafb_defined.green.length =
 350                 vesafb_defined.blue.length =
 351                 vesafb_defined.bits_per_pixel;
 352         }
 353
 354         printk(KERN_INFO "vesafb: %s: "
 355                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
 356                (vesafb_defined.bits_per_pixel > 8) ?
 357                "Truecolor" : "Pseudocolor",
 358                screen_info.rsvd_size,
 359                screen_info.red_size,
 360                screen_info.green_size,
 361                screen_info.blue_size,
 362                screen_info.rsvd_pos,
 363                screen_info.red_pos,
 364                screen_info.green_pos,
 365                screen_info.blue_pos);
 366
 367         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 368         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
 369
 370         /* request failure does not faze us, as vgacon probably has this
 371          * region already (FIXME) */
 372         request_region(0x3c0, 32, "vesafb");
 373
 374 #ifdef CONFIG_MTRR
 375         if (mtrr) {
 376                 unsigned int temp_size = size_total;
 377                 unsigned int type = 0;
 378
 379                 switch (mtrr) {
 380                 case 1:
 381                         type = MTRR_TYPE_UNCACHABLE;
 382                         break;
 383                 case 2:
 384                         type = MTRR_TYPE_WRBACK;
 385                         break;
 386                 case 3:
 387                         type = MTRR_TYPE_WRCOMB;
 388                         break;
 389                 case 4:
 390                         type = MTRR_TYPE_WRTHROUGH;
 391                         break;
 392                 default:
 393                         type = 0;
 394                         break;
 395                 }
 396
 397                 if (type) {
 398                         int rc;
 399
 400                         /* Find the largest power-of-two */
 401                         while (temp_size & (temp_size - 1))
 402                                 temp_size &= (temp_size - 1);
 403
 404                         /* Try and find a power of two to add */
 405                         do {
 406                                 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
 407                                               type, 1);
 408                                 temp_size >>= 1;
 409                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
 410                 }
 411         }
 412 #endif
 413
 414         info->fbops = &vesafb_ops;
 415         info->var = vesafb_defined;
 416         info->fix = vesafb_fix;
 417         info->flags = FBINFO_FLAG_DEFAULT |
 418                 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
 419
 420         if (!ypan)
 421                 info->fbops->fb_pan_display = NULL;
 422
 423         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 424                 err = -ENOMEM;
 425                 goto err;
 426         }
 427         if (register_framebuffer(info)<0) {
 428                 err = -EINVAL;
 429                 fb_dealloc_cmap(&info->cmap);
 430                 goto err;
 431         }
 432         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 433                info->node, info->fix.id);
 434         return 0;
 435 err:
 436         framebuffer_release(info);
 437         release_mem_region(vesafb_fix.smem_start, size_total);
 438         return err;
 439 }
 440
 441 static struct platform_driver vesafb_driver = {
 442         .probe  = vesafb_probe,
 443         .driver = {
 444                 .name   = "vesafb",
 445         },
 446 };
 447
 448 static struct platform_device vesafb_device = {
 449         .name   = "vesafb",
 450 };
 451
 452 static int __init vesafb_init(void)
 453 {
 454         int ret;
 455         char *option = NULL;
 456
 457         /* ignore error return of fb_get_options */
 458         fb_get_options("vesafb", &option);
 459         vesafb_setup(option);
 460         ret = platform_driver_register(&vesafb_driver);
 461
 462         if (!ret) {
 463                 ret = platform_device_register(&vesafb_device);
 464                 if (ret)
 465                         platform_driver_unregister(&vesafb_driver);
 466         }
 467         return ret;
 468 }
 469 module_init(vesafb_init);
 470
 471 MODULE_LICENSE("GPL");